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Image Resizer

Resize a photo to exact pixels, a percentage, or a print size in cm — with an optional KB limit.

Also searched as: photo resizer in kb · resize image to 20kb · kb resizer

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Resize an image in pixels, percent, cm or inches

  1. Choose a photo (or several).
  2. Type the width and height in pixels, a percentage, or a print size in cm/inch at a DPI — the tool converts it to pixels for you (3.5 × 4.5 cm at 300 DPI = 413 × 531 px).
  3. Optionally set a maximum file size in KB and tap Resize.

Keep aspect ratio is on by default, so entering only a width calculates the height and nothing looks stretched. Turn it off only when a form insists on exact pixel dimensions — the picture is then cropped to the centre rather than squashed.

Popular sizes

UseSize
Instagram post / portrait / story1080×1080 / 1080×1350 / 1080×1920
YouTube thumbnail1280×720 (16:9)
WhatsApp DP640×640 (square)
Passport photo 3.5×4.5 cm413×531 at 300 DPI · 276×354 at 200 DPI
IBPS / SBI photo & signature200×230 · 140×60
A4 print at 300 DPI2480×3508

For a KB limit without changing dimensions use compress image to KB; for exam-specific presets see the photo & signature resizer.

Frequently asked questions

How do I resize a photo to 3.5 × 4.5 cm?

Open the cm / inch tab, enter 3.5 and 4.5 with 300 DPI and tap Resize — you get a 413 × 531 pixel image, the standard passport size.

How do I resize an image to 20 KB?

Enter your dimensions, type 20 in the 'Max file size' box and choose JPG. The tool lowers quality until the file is under 20 KB.

Does resizing reduce quality?

Making an image smaller keeps it sharp. Making it larger than the original cannot add detail, so avoid enlarging more than about 2×.

Which format should I choose?

JPG for photos (smallest), PNG for logos, screenshots or anything with transparency, WEBP for websites.

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